Mapping SQL UDT to java class
| От | Shen, Ning (NSHEN) |
|---|---|
| Тема | Mapping SQL UDT to java class |
| Дата | |
| Msg-id | 4FC8132E70CFB64C964AA968B5592A8C1961E7DF@EXANPMB2.arinc.com обсуждение исходный текст |
| Ответы |
Re: Mapping SQL UDT to java class
(Dave Cramer <pg@fastcrypt.com>)
|
| Список | pgsql-jdbc |
Hi
We have some user defined data types in our database. For instance, ICAO type is defined as follow:
CREATE TYPE "ICAO" AS
("Type" smallint,
"Addr" bytea);
In my java client side, I have:
public class ICAO implements SQLData {
@Override
public void readSQL(SQLInput aStream, String aTypeName)
{
typeName = aTypeName;
try {
icaoType = aStream.readShort();
icaoAddr = aStream.readBytes();
}
catch (SQLException e) {
e.printStackTrace();
}
}
@Override
public void writeSQL(SQLOutput aStream)
{
try {
aStream.writeShort(icaoType);
aStream.writeBytes(icaoAddr);
}
catch (SQLException e) {
e.printStackTrace();
}
}
@Override
public String getSQLTypeName()
{
return typeName;
}
public void setType(short aType)
{
icaoType = aType;
}
public void setAddr(String aHexAddr)
{
icaoAddr = numToBytes(hexToInt(aHexAddr));
}
private short icaoType;
private byte[] icaoAddr;
private String typeName = "ICAO";
// ******* unit test driver
public static void main(String[] args)
{
final String AVLC_SELECT = "SELECT \"RSSI\", \"SymbolCount\", \"ReedSolErr\", \"Quality\", \"FlagCount\", \"LowConfidence\", \"BrokenMsg\", \"BadCRCCount\", \"AVLC\".\"DateTime\", \"TimeStamp\", \"LineNum\", \"SourceFiles\".\"Station\", \"AVLC\".\"Src\", \"Dest\", \"AVLC\".\"Msg\" AS \"AVLCMsg\", \"SQP\".\"Msg\" AS \"SQPMsg\", \"AVLC\".\"RadioAddr\", \"FileName\", \"LogType\", \"SentRecv\", \"AG\", \"CR\", \"P\", \"F\", \"Type\", \"NS\", \"NR\", \"Score\", \"Delay\", \"SREJPairs\", \"XIDType\", \"Information\", \"XIDInfo\", \"BlockID\", \"Label\", \"Address\", \"MSN\", \"Text\", \"Agency\", \"Flight\", Stations.\"RadioNum\", Stations.\"Freq\", COALESCE(Stations.\"Char\", '?') \"Char\", \"UpDownOther\"(\"AVLC\".\"RadioAddr\", \"AVLC\".\"Src\", \"Dest\"), \"RFLength\"(\"AVLC\".\"Msg\"), \"ULReportInd\".\"DateTime\" \"ULReportIndDateTime\", \"CSMADecisionTime\", \"TM1\", \"TM2\", \"TM3\", \"p\""
+ "FROM \"AVLC\""
+ "NATURAL JOIN \"SourceFiles\""
+ "LEFT OUTER JOIN \"SQP\" USING(\"RadioAddr\", \"SQPFileNum\", \"SQPLineNum\")"
+ "LEFT OUTER JOIN \"ULReportInd\" USING(\"RadioAddr\", \"ULReportIndFileNum\", \"ULReportIndLineNum\")"
+ "LEFT OUTER JOIN \"ARINC618\" USING(\"FileNum\", \"LineNum\")"
+ "LEFT OUTER JOIN Stations USING(\"Station\", \"RadioAddr\")";
final String AVLC_AC_WHERE = "WHERE (\"Dest\" = ? OR \"Src\" = ?) AND \"AVLC\".\"DateTime\" BETWEEN ? AND ?";
final String STATIONS = "WITH Stations AS"
+ "("
+ "SELECT DISTINCT \"Station\", \"RadioAddr\", \"RadioNum\", \"Freq\", \"Char\""
+ "FROM \"Radios\""
+ "NATURAL JOIN \"SourceFiles\""
+ "LEFT OUTER JOIN \"InstChar\" USING(\"Freq\")"
+ ")";
String query = STATIONS + AVLC_SELECT + AVLC_AC_WHERE;
ICAO clnpIcao = new ICAO();
clnpIcao.setType((short)1);
clnpIcao.setAddr("400AE7");
Connection pgConn = (new VdlPgDBConnection("Field20151015")).getConnection();
try {
PreparedStatement stm = pgConn.prepareStatement(query);
Map<String, Class<?>> newMap = pgConn.getTypeMap();
if (newMap == null)
{
newMap = new java.util.HashMap<String, Class<?>>();
}
newMap.put("public.ICAO", ICAO.class);
pgConn.setTypeMap(newMap);
Timestamp st = Timestamp.valueOf("2015-10-15 10:00:00.0");
Timestamp et = Timestamp.valueOf("2015-10-15 12:00:00.0");
stm.setObject(1, clnpIcao);
stm.setObject(2, clnpIcao);
stm.setTimestamp(3,st);
stm.setTimestamp(4,st);
ResultSet result = stm.executeQuery();
List<List<Object>> table = new ArrayList<List<Object>>();
List<Object> row = new ArrayList<Object>();
Object colData;
while (result.next())
{
for (int i = 1; i <= result.getMetaData().getColumnCount(); i++)
{
colData = result.getObject(i);
if (colData != null)
row.add(colData);
else
row.add("<null>");
}
System.out.print("\n row = " + row);
table.add(row);
}
}
catch (SQLException e)
{
e.printStackTrace();
}
} // ******* end of main()
} // end of ICAO class
The error message I got is:
“Can't infer the SQL type to use for an instance of vdlmenu.ICAO. Use setObject() with an explicit Types value to specify the type to use. ”
However, for the overloaded setObject((int parameterIndex, Object x, SQLType targetSqlType)) and setObject(int parameterIndex, Object x, int targetSqlType),
What is the value for the 3rd parameter?
Thanks
Ning
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